After our story aired, we received a number of emails from viewers offering their help. And Polly Klitz got another, big, important clue:
"It's definitely a Rocky's ring," she said, holding up the ring and a magnifying glass. "I have looked at this ring through this thing and I can see that it has the R and the I in the middle."
It is the same emblem you'll find on the cover of the 1975 Rock Island High School yearbook.
In that yearbook, there are three seniors with the initials L.S. - the same ones on the ring.
One of those people has a sister who lives in Davenport, who watches TV-6:
"She saw the clip with Polly and...she called me and said 'Oh my gosh! Oh my gosh!'" Linda Adler recalled in a phone interview this week.
Adler's maiden name is Soady.
She now lives in Colorado.
But all it took was a few emails for L.S. - class of '75 - and Polly Klitz to get in touch.
"She had a lot to say, and I thanked her for hanging on to it that long," Adler said of her initial conversation with Klitz.
"I really enjoyed talking to her on the phone, and she seems excited to get the ring and I'm happy for her to receive it," Klitz said.
"It's just difficult to see something that doesn't belong to you that you know might bring good memories to somebody else," she added.
Those memories are especially meaningful in Adler's case.
The class ring is a tangible reminder for a woman with memory problems, which are lasting effects of a stroke three years ago.
Those memory problems add another layer to this mystery.
"I still don't know if it is mine," Adler said.
Adler can't remember when her ring went missing - whether it was lost or stolen. And, she doesn't know if she was at the same concert where the ring was found, or whether she had ever been to that concert venue at all.
But something tells her this ring is hers. Probably. At least she hopes it is.
And, Polly Klitz feels the same way.
"I'm just keeping my fingers crossed that she recognizes it and knows that it's hers," Klitz said.
"I'd just be so pleased, and appreciate Polly," Adler said, "Otherwise I'd probably never see that ring again."
Now, decades after Polly's quest to return the ring started, the mystery may finally be solved, and the ring is in the mail.